55 lines
2.4 KiB
C
55 lines
2.4 KiB
C
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/*
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* Copyright (C) 2010 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef LINKER_ENVIRON_H
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#define LINKER_ENVIRON_H
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/* Call this function before anything else. 'vecs' must be the pointer
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* to the environment block in the ELF data block. The function returns
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* the start of the aux vectors after the env block.
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*/
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extern unsigned* linker_env_init(unsigned* vecs);
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/* Unset a given environment variable. In case the variable is defined
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* multiple times, unset all instances. This modifies the environment
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* block, so any pointer returned by linker_env_get() after this call
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* might become invalid */
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extern void linker_env_unset(const char* name);
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/* Returns the value of environment variable 'name' if defined and not
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* empty, or NULL otherwise. Note that the returned pointer may become
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* invalid if linker_env_unset() or linker_env_secure() are called
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* after this function. */
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extern const char* linker_env_get(const char* name);
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/* Remove unsecure environment variables. This should be used when
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* running setuid programs. */
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extern void linker_env_secure(void);
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#endif /* LINKER_ENVIRON_H */
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